CN101583330B - Absorbent core having improved structure - Google Patents
Absorbent core having improved structure Download PDFInfo
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- CN101583330B CN101583330B CN2008800021655A CN200880002165A CN101583330B CN 101583330 B CN101583330 B CN 101583330B CN 2008800021655 A CN2008800021655 A CN 2008800021655A CN 200880002165 A CN200880002165 A CN 200880002165A CN 101583330 B CN101583330 B CN 101583330B
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- layer
- absorbent
- gelling material
- absorbent gelling
- sanitary towel
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
- A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15203—Properties of the article, e.g. stiffness or absorbency
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
- A61L15/00—Chemical aspects of, or use of materials for, bandages, dressings or absorbent pads
- A61L15/16—Bandages, dressings or absorbent pads for physiological fluids such as urine or blood, e.g. sanitary towels, tampons
- A61L15/42—Use of materials characterised by their function or physical properties
- A61L15/60—Liquid-swellable gel-forming materials, e.g. super-absorbents
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/15203—Properties of the article, e.g. stiffness or absorbency
- A61F2013/15284—Properties of the article, e.g. stiffness or absorbency characterized by quantifiable properties
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/53051—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged
- A61F2013/530547—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials being only in particular parts or specially arranged positioned in a separate layer or layers
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F13/00—Bandages or dressings; Absorbent pads
- A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
- A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
- A61F2013/530481—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials
- A61F2013/530708—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having superabsorbent materials, i.e. highly absorbent polymer gel materials characterized by the absorbency properties
Abstract
Absorbent core for disposable absorbent articles, particularly for the absorption of menses or blood.
Description
Invention field
The present invention relates to for the absorbent article absorbent cores of sanitary towel etc. for example.
Background of invention
The absorbent article that is used for absorb body fluids such as menstruation or blood is known in the art, and comprises for example feminine hygiene article, such as sanitary towel, panty liners, tampon, interlabial devices and wound dressing etc.When for example considering sanitary towel, these goods generally include as towards the liquid permeable topsheet of wearer's layer, as egative film and the absorbent cores between top flat and egative film towards the liquid non-permeate of clothes layer.Body fluid is gathered by top flat, and subsequently is stored in the absorbent cores.Egative film can prevent absorbed fluid wets wearer's clothes.
Absorbent cores can comprise one or more fibrous absorbent materials, described absorbing material can comprise for example cellulose fibre (being generally wood pulp cellulose), synthetic fibers or their combination of natural fiber as known in the art then, as for example combination (each is formed by selected fiber type) of batt or non-woven material or tissue layers of different fibrous layers, or comprise the layer of being made by different natural fibers and/or synthetic fibers.Described structure can comprise the different single layer that engages or combine, or alternatively, described structure can be by form the structure that different layers prepares with the continuation method that hereinafter will limit in more detail.
What be similarly this area institute likewise known is, when the part (being generally absorbent cores) of goods comprises superabsorbent material, such as being the fine dispersion form usually for example during common absorbent gelling material of a granular form (AGM), can be of value to absorption and the retention characteristic of absorbent article.That the superabsorbent material that can be used for absorbent article known in the art generally includes is water-insoluble, water-swellable, form the crosslinked absorbable polymer of hydrogel, and described material can absorb a large amount of liquid and can keep this type of absorbed liquid under middle pressure.Absorbent gelling material can be incorporated in the absorbent article by different known ways, is incorporated into usually in the cored structure; For example, absorbent gelling material of a granular form can be dispersed in the included fibrolaminar fiber of core, or is localised between each fibrous layer with the layout that concentrates more on the contrary, or is localised in the pocket, as known in the art.
In general, the absorbent article that comprises absorbent gelling material has good absorption and retention characteristic to body fluid such as urine usually.Yet, still have much room for improvement it for other body fluid absorption and reservation.Specifically, menstruation and blood especially are difficult to be effectively absorbed and retained in the absorbent article that comprises superabsorbent material, because described material does not demonstrate best absorption and retention characteristic to described body fluid.
The absorption of this non-the best and keep mainly results from superabsorbent material to the relatively poor permeability of menstruation and blood, therefore then owing to viscosity and/or the recombination property of these fluids.Menstruation and blood are actually water-based fluid, and described fluid comprises higher molecular weight, also comprise the blood cell component, and described component comprises erythrocyte, leukocyte, soluble protein, cell debris and mucus, their superabsorbents absorptions to these fluids of can slowing down.Therefore the suitable stiff of menstruation and blood more is difficult to be absorbed in the conventional absorbing structure that comprises absorbent gelling material by nature.In addition, blood cell component such as erythrocyte also can reduce the absorptive capacity of some super absorbing particles.This is converted into fluid slower initial absorption speed in the superabsorbent material that is ingested, when being ingested in the absorbing structure that comprises superabsorbent material then, and described slower speed can cause lower final absorption and reserve capacity.
In addition, when considering fibrous absorbent material more generally, known different fiber and different fibre structures can demonstrate different behaviors and effectiveness to body fluid especially menstruation with blood.For example, cellulose fibre for example wood pulp cellulose demonstrates bigger absorption and diffusion capacity to the aqueous distillate of menstruation and blood, described aqueous distillate can very rapidly be gathered and can be transmitted in fibre structure and away from the initial acquisition zone, and blood cell and higher molecu lar weight component can not spread equally well, therefore can keep near the initial acquisition zone.This type of blood cell and higher molecu lar weight component are tending towards preferentially advancing in the direction perpendicular to the plane of absorbing structure.In addition, natural fiber and composite fibre materials can be suitable for providing densification or the heavy absorbing structure that is intended to for absorbent cores more or less.
The trend of recent years is tended to use thinner and more effective absorbing structure, and described absorbing structure utilizes the combination of common fibre structure and superabsorbent material.Described thinner structure can provide the absorbent article that has made up better comfort, privacy and the suitability then.
Although known have a variety of various combinations of fiber and absorbent gelling material and different absorbent core structures of layout of having, but still need a kind of for absorbent article, in particular for absorbing the improved absorbent core structures of menstruation or blood, it utilizes different absorbing materials absorbing and managing specificity aspect these compound body fluid, thereby in stable thinner structure, or under any situation that when absorbing, is changing (for example increasing) its thickness between its whole normal operating period indistinctively, obtain the better result who weighs with fluid acquisition and distribution.
Summary of the invention
The present invention has solved the demand by a kind of absorbent cores for absorbent article is provided, and described absorbent cores has towards wearer's surface with towards the surface of clothes; This core comprises the cellulosic layer structure of at least two layers, and described layer comprises:
Ground floor, it comprises cellulose fibre and is substantially free of absorbent gelling material;
The second layer, it comprises fiber and absorbent gelling material and is substantially free of cellulose fibre;
This core comprises less than 70%, preferably less than 55%, and more preferably 10% to 40% cellulose fibre; And
This core comprises less than 70%, preferred 10% to 40% absorbent gelling material,
Wherein percentage ratio is based on the percentage by weight of the dry weight of core.
Summary of drawings
Fig. 1 is the cross sectional representation of sanitary towel, and it shows the inside layer structure of absorbent cores as described in an embodiment of the present invention.
Fig. 2 is the cross sectional representation as a described absorbent cores of alternative embodiment of the present invention.
Detailed Description Of The Invention
The present invention relates to be used to the absorbent cores that is intended to for the absorbent article of absorb body fluids such as menstruation and blood, described absorbent article comprises such as sanitary towel, panty liners, tampon, interlabial devices, wound dressing etc.In the context of the present invention, Exemplary absorbent articles is disposable absorbent article.Term used herein " disposable " is used for describing does not prepare washing, or the goods of in other words not preserving again or reusing as goods (namely are intended to and will namely be dropped after the use of their singles, and preferably be recovered, compost treatment, or in other words to handle with the mode of environmentally compatible).This paper will in conjunction with a kind of typical absorbent article for example sanitary towel absorbent cores of the present invention is described.Usually, this based article can comprise following element: liquid permeable topsheet, egative film and be positioned at described top flat and described egative film in the middle of absorbent cores.
In general, top flat should have better fluid transmission property keeping dry the surface, thereby keeps wearer's skin dry and comfortable.Absorbent cores should provide desirable absorptive capacity, and can allow steam and/or air to flow to pass it.Egative film generally should prevent wet to keep absorbed fluid; Egative film also can be breathable.In addition, each element can be engaged with each other, and makes final products can have desirable comfortableness and performance level.
Used term " cellulose fibre " in the following description.Cellulose fibre comprises based on cellulosic naturally occurring fiber, for example cotton, linen etc.Wood pulp cellulose is an example of cellulose fibre as described in the present invention.Also can be considered to cellulose fibre as described in the present invention derived from cellulosic staple fibre such as regenerated cellulose (artificial silk) or partially or even wholly acetylizad cellulose derivative (for example cellulose acetate or triacetate).
In the following description of this invention, be called the surface towards the wearer towards the surface of wearer's direction.In addition, be called surface towards clothes towards the surface of clothes direction.Therefore, absorbent article of the present invention with and any element for example absorbent cores all have towards wearer's surface with towards the surface of clothes.
The absorbent article assembly
Top flat
According to the present invention, absorbent article can comprise liquid permeable topsheet.The top flat that is applicable to this paper can comprise weaving material, non-woven material and/or comprise the three dimensional network of thin polymer film of the liquid non-permeate of the permeable aperture of liquid.In Fig. 1, top flat is indicated with drawing reference numeral 30.For example, towards and contact wearer's surface can be provided by the thin-film material with aperture, described aperture is used for promoting from the liquid towards absorbing structure transmits towards wearer's surface.The permeable perforated film of this class I liquid I is well known in the art.They can provide three-dimensional fiber shape structure springy.This type of thin film for example at length is disclosed in the following patent: US 3929135, US 4151240, US 4319868, US4324426, US 4343314, US 4591523, US 4609518, US 4629643, US 4695422 or WO 96/00548.
The top flat that can be used for this paper can be monolayer and maybe can have a plurality of layers.In one embodiment of the invention, top flat is monolayer at its four corner, described monolayer provide top flat towards wearer's surface with towards the surface of clothes.Randomly, be arranged in top flat on wearer's surface but the extra play that only extends in the neighboring area of goods can be used to provide extra flexibility or extra liquid handling/reserve capability (this design is commonly referred to " mixing top flat ") ideally.But top flat extends at whole absorbing structure usually, and may extend into and form in preferred optional flank, side parcel element, flap or the auricle part or all.Top flat also can be wrapped in the absorbent cores edge around.
It is submissive, soft feel that top flat should be generally, and the skin that should not stimulate the wearer.It also can have elastic characteristic, thereby can stretch in one or more directions.Top flat can provide the collection of convection cell and fluid transmitted from the wearer towards absorbent cores and can hold absorbent cores.Except permeability for liquids, top flat also can have high vapour permeability and/or air permeability.
Absorbent cores
According to the present invention, absorbent cores is layer structure, and it can be a kind of following structure as required, and described structure is provided as and makes it can not be separated into single layer, although have potential internal physical and/or the modification of chemical characteristic.This class formation is known in the art, and can prepare by form different layers (for example by the air lay technology) with continuation method.And it is can be separated from one another again by the some single layer of structure of making that makes up by for example macroscopical mechanical part or adhesive means or be engaged with each other, though difficult sometimes.Alternatively, this class formation also can constitute absorbent cores as described in the present invention, the single layer that wherein has ideal characterisitics can and may engage according to the methods known in the art combination, for example realizes by means of binding agent or hot adhesion or mechanical adhesion or their any combination.
In certain embodiments, absorbent cores 40 of the present invention can have less than 12mm in drying regime, or less than 8mm, or less than 5mm, or the general thickness of 2mm to 0.5mm.The basis weight range of absorbent cores 40 can be 50g/m
2To 300g/m
2, or 90g/m
2To 250g/m
2, or 100g/m
2To 150g/m
2In situation of the present invention, the thickness of each structure or layer (being in dry condition or wetting situation) is intended to measure under the pressure of appointment with any suitable device known in the art.According to the present invention, described thickness is at 20g/cm
2Measure under the pressure (1.96kPa), for example with being derived from Loerentzen ﹠amp; The calibrator APP 51D20 model 02101 of Wettre (Box 4S-16393 Stockholm) is under aforesaid pressure and at 10cm
2Area on measure.
According to one embodiment of the invention, ground floor 50 can be positioned at absorbent cores 40 on wearer's surface, and can the actual described surface towards the wearer that constitutes as shown in Figure 1, and the second layer 60 can be positioned at ground floor below and core adjacent thereto on the surface of clothes, constitute described surface towards clothes in certain embodiments, shown in the embodiment of Fig. 1.
According to the present invention, absorbent cores 40 totally comprises the cellulose fibre less than 70%, or less than 55%, or 10% to 40%, and less than 70% absorbent gelling material, or 10% to 40%, wherein said percentage ratio all is considered to the percentage by weight based on the dry weight of absorbent cores 40.
Have surprisingly been found that, absorbent cores with above-mentioned characteristic can provide absorption and the processing capacity to body fluid (especially compound body fluid is such as menstruation and blood) of improvement with common thin and comfortable structure, and described structure has the dimensional stability of improvement, such as hereinafter detailed description.
Absorbent cores is thin basically, and when carrying out the transition to wetting situation from dry condition, changes its thickness indistinctively, that is, when absorbing liquid, the shown value that goes out when keeping its thickness near dry condition.In situation of the present invention, this dimensional stability can be by relatively dry density and wet density are represented.Absorbing structure for example the density of absorbent cores of the present invention with g/cm
3Expression, and can be s known as technical staff, by adaptive unit suitably directly by the basic weight (g/m of certain layer
2) and thickness (mm) calculate, wherein thickness as mentioned specified when drying regime and wetting state two states at 20g/cm
2Evaluate and test under the pressure (1.96kPa).Dry density and any other parameter of linking to each other with " drying " word for example dry weight all in dry structure or layer evaluation and test, the structure after wherein so-called " dry structure or layer " refers to nurse one's health 24 hours under 25 ℃ and 50% relative humidity.Wet density is evaluated and tested after following process: suitable structure sample is immersed in artificially continues 120 minutes up to reaching capacity in liquid (AMF), and subsequently keep sample to hang five minutes or any situation stops to eliminate any unnecessary fluid basically up to dropping liquid.The basic weight that be used for to calculate wet density for after having eliminated any unnecessary fluid as described above, by the basic weight of the saturated sample of AMF.AMF prepares according to method hereinafter described.
Absorbent cores of the present invention can be by increasing its density and exceedingly not increasing body fluid that its thickness absorbs correlative for example menstruation or blood basically in wetting situation, although it comprise relatively in the cellulose fiber peacekeeping absorbent gelling material of equal percentage.Therefore, absorbent cores of the present invention has bigger efficient aspect compound body fluid such as common menstruation and the blood absorbing and handle.
According to one embodiment of the invention, absorbent cores has wet density, described wet density can be greater than 5 to 20 times of dry densities, or greater than 8 to 15 times of dry densities, this means when initial, thin structure can increase its density when absorbing liquid, therefore keep its thickness almost constant or only increase slightly and do not demonstrate significant swelling, and the absorbent article that described swelling can make absorbent cores during use and comprise it then becomes comparatively heavy and be may comfortableness relatively poor.Therefore, absorbent cores of the present invention has been utilized the absorptive capacity of its component material more efficiently.
The dry density of absorbent cores of the present invention can be between 0.04g/cm
3And 0.3g/cm
3Between, or between 0.08g/cm
3And 0.15g/cm
3Between.
Ground floor
The second layer
The second layer 60 comprises absorbent gelling material 70 and is substantially free of cellulose fibre.Except cellulose fibre, also the fiber of any kind of known in the art can be included in the second layer 60.Can use known synthetic fibers, for example polyethylene, polypropylene, polyester, Fypro.Also can in the second layer 60, use bicomponent fibre.
As used herein, the term bicomponent fibre refers to have two kinds of component fibers.Usually, bicomponent fibre is made of relatively similar component, and the difference of described component for example is their melt temperature or softening temperature.In situation of the present invention, particular is the polypropylene, polyethylene bicomponent fibre, but other combination also is feasible combination such as polyester/polyethylene, polyester/polypropylene, polyamide/polyester, polyamide/polyethylene and polyamide/polypropylene.Yet, the conventional material that uses is above-mentioned polypropylene, polyethylene fiber composition, described compositions provides with certain form, make in the profile of fiber, material with higher melt or softening point provide fiber core the middle part and be responsible for the fiber conveying capacity usually and have certain rigidity or the ability of the structure with resilience force is provided, and the outer coatings on the core of fiber has lower fusing point and be used for promoting comprising the hot adhesion of the substrate of this fibrid.The so-called axle core design of this bicomponent fibre can not be accurately point-symmetric with the central point of cross section, but provides the shaft portion of fiber in order to make fiber crimp with unsymmetric form.Find that this can advantageously influence resilience force and the intensity of fiber.
In typical embodiments as described in the present invention, polypropylene cores has the polyethylene coated of unsymmetric form in the outside, make that in a highly preferred embodiment, about 50% fibrous material is polypropylene, and 50% fibrous material is polyethylene.Certainly, also can select other quantitatively and will depend on overall fibre dimensions to a great extent, because preferably the binding agent on the fiber surface that is provided by polyethylene need have certain thickness in order to good bonding is provided with regard to absolute magnitude, and its relative quantity can change.
The second layer 60 also comprises one or more absorbent gelling materials 70.These absorbent gelling materials can absorb a large amount of aqueous body fluids usually, and can further keep this absorbed fluid under modest pressure.Absorbent gelling material can be equably or anisotropically is dispersed in the structure of the second layer 60, namely is dispersed between the fiber.
According to the present invention, the suitable absorbent gelling material that can be used for this paper can be selected from common Polyacrylate based materials of a granular form.The Polyacrylate based materials that is incorporated in the absorbent article of the present invention is the polyelectrolyte that has a plurality of anionic functional groups (being generally carboxyl).In certain embodiments, Polyacrylate based materials can comprise polyacrylate, polymethacrylates and their derivant for example sodium polyacrylate, sodium polymethacrylate, polyacrylic acid potassium, polymethylacrylic acid potassium, starch graft polyacrylate, starch-grafted polymethacrylates, polyvinyl alcohol graft copolymerized polyacrylate, polyvinyl alcohol graft copolymerized polymethacrylates, cellulose graft polyacrylate, cellulose graft polymethacrylates etc.In one embodiment of the invention, absorbent gelling material can be polyacrylate crosslinked, the part neutralization.
As known in the art, provide the polyelectrolyte that is incorporated into the Polyacrylate based materials in the absorbent article of the present invention to be made by polymerisable undersaturated acidiferous monomer.This type of monomer comprises the undersaturated acid of alkeneization and anhydride, and described acid and anhydride comprise at least one carbon carbon olefinic double bond.More particularly, these monomers can be selected from the undersaturated carboxylic acid of alkeneization and anhydride, the undersaturated sulfonic acid of alkeneization and their mixture.
Polyacrylate based materials (being generally the polymer of part neutralization) is incorporated in the absorbent article usually and is called as super absorbent polymer (SAP) or superabsorbents, and is crosslinked.According to the mechanism of knowing, polyacrylate material has the carboxylic acid group who breaks away from (having sodium usually) main polymer chain of neutralization.During contact water, sodium can separate and enter in the solution, only stays carboxylic ions.Because electronegative, these ions repel mutually, make polymer unwinds and absorb increasing water.But when the more carboxylic ions time spent, described water transfers to be attracted by carboxylic ions.Since exist with atom between the relevant atomic bond of polar forces, the hydrogen in the water is caught by polyacrylate.The crosslinked three dimensional structure that causes of the polymer chain that bridge joint is different, described structure constitute the gel of swelling when absorbing liquid.
According to one embodiment of the invention, can be comprised in the polyacrylate based polyalcohol described in the European patent application EP 05023061.4 that absorbent gelling material in the second layer 60 of absorbent cores can be filed on October 21st, 2005 from the name with P﹠G and select.As illustrated in the referenced patent application, with very slight crosslinked or basically at all uncrosslinked Polyacrylate based materials be incorporated into for absorption protein shape or serosity shape body fluid (for example menstruation, blood, blood plasma, vaginal secretions and mucus or emulsion, especially menstruation or blood) absorbent article in, the absorption rate to this type of body fluid absorption and reserve capacity and improvement of comparing improvement with the crosslinked superabsorbents of tradition can be provided.
According to the above patent application of reference, can polymer in the solubilized umber that maybe can extract represent to measure based on the degree of cross linking of the polymer of polyacrylate.As known in the art, low-molecular-weight polymer chain can dissolve in polymer or be extracted out under certain conditions, and they self have just represented solubilized described in the polymer maybe can extract umber.In general, can extract umber and be considered to be inversely proportional to the degree of cross linking, namely the degree of cross linking is more high, and umber is just more low, and this is because in fact the polymer body of larger proportion is incorporated in the polymer network.This type of polyacrylate based polyalcohol (it can be incorporated in the absorbent article and to be used for absorbing protein shape or serosity shape body fluid, especially menstruation) has by weight and surpasses 15%, or surpasses 20%, or surpasses 30% extracted umber.Ideally, the described umber that extracts can be no more than 60% by the weight of Polyacrylate based materials, or is no more than 50% by weight.Can extract umber tests to evaluate and test according to the extractable matter described in the European patent application EP 05023061.4 of above reference.
Absorbent gelling material usually can discrete particle form use.This type of absorbent gelling material can have any desired shape, for example sphere or hemispherical, cube, bar-shaped multiaspect shape etc.The shape that the greatest dimension/smallest dimension ratio is bigger as pin and thin slice, also can be imagined for herein.Also can use the particle agglomerates of absorbent gelling material.
The size of described absorbent gelling material granule can change in relative broad range.For example, can use between 10 μ and 1,000 μ, or between 50 μ and 1,000 μ, or between 100 μ and 800 μ, or the granularity between 150 μ and 600 μ.As used herein, " granularity " refers to the weighted mean of the smallest dimension of individual particle.
As known in the art, depend on the desirable absorptive capacity of the absorbent article that comprises core usually according to one embodiment of the invention, absorbent gelling material can 2g/m
2To 100g/m
2, or 10g/m
2To 90g/m
2, or 20g/m
2To 50g/m
2Basic weight be provided in the second layer 60 of absorbent cores 40.Absorbent gelling material can be 10% to 95% by the dry weight basis of the second layer 60, or 50% to 90%, or 70% to 85%.
The second layer 60 can have 20g/m
2To 100g/m
2, or 30g/m
2To 60g/m
2Overall basic weight.
According to the present invention, the second layer 60 has the dimensional stability of improvement equally when drying regime and wetting state, namely can not increase thickness basically when absorbing liquid.As known in the art, this can be for example comprises that by heat treatment suitably the second layer 60 of bicomponent fibre and absorbent gelling material granule provides, and this can cause the local fusing of the outer coatings of bicomponent fibre along with the generation of bonding.Can be used to provide other method known in the art of dimensional stability can be to the second layer 60 and for example in structure, comprise thin cohesiveness fiber, but or comprise thermoplastic granulates hot melt and heat-activatable, such as polyethylene powders.
Optional the 3rd layer
According to an alternative embodiment shown in Figure 2, absorbent cores 40 of the present invention also can comprise the 3rd layer 80 of the contiguous second layer 60, described the 3rd layer can be positioned in the embodiment of Fig. 2 on the surface of clothes, and in fact described surface constitutes the described surface towards clothes in three layers the structure.Can have the structure substantially the same with ground floor 50 for the 3rd layer 80, namely comprise the synthetic fibers that the cellulose fiber peacekeeping is optional, and be substantially free of absorbent gelling material.Material of the 3rd layer that should be optional and composition can with specified identical of the ground floor that above is absorbent cores.
Optional the 3rd layer 60 can have 20g/m
2To 100g/m
2, or 30g/m
2To 60g/m
2Overall basic weight.
According to one embodiment of the invention, can absorbent cores be provided as single structure by known method.For example, the combination of hot adhesion or felting or these combination step can produce described structure.Therefore, the core that is made of single structure can provide in the following way: with continuation method (for example air lay technology) with above-mentioned various material-pavings to over each other, carry out press polish then in order to reduce thickness of structure and bulkiness on demand.The press polish step can produce compacting, and it can provide identical power in total.Then, can with this press polish randomly succeeded by hot adhesion or with pin felting or certain combination such as hot pin felting and make absorbent core structures be exposed to hot-air, in order to obtain thickness, density and the structural stability of desirable level, described stability will influence the final dimensional stability of absorbent cores then.
Alternatively, absorbent cores of the present invention also can provide in the following way: make up and randomly engage the different independent single layer that forms with aforesaid ideal characterisitics with known method.
Be not bound by any theory, it is believed that absorbent cores of the present invention has for gathering, manage and keeping the especially capacity of the improvement of menstruation and blood of compound body fluid, this is owing to particular combination and the composition of its material component, and in one embodiment of the invention, also owing to they layouts separately.
In absorbent cores of the present invention, at least the first and second layers can provide concrete Liquid Absorption and management characteristic separately.That is, comprise that cellulose fibre and the ground floor that is substantially free of absorbent gelling material can provide the quick collection of convection cell (being generally menstruation or blood), wicking and transmit watery distillate and see through its thickness basically and transmit blood cell fraction and compound fraction rapidly.Because no superabsorbent material is present in the ground floor, so do not exist its overall absorption capacity to be absorbed the risk that Binder Materials is damaged the relatively poor absorption characteristic of the blood cell fraction of body fluid (being generally menstruation or blood) and compound fraction.And the second layer comprises synthetic fibers and superabsorbent material and is substantially free of cellulose fibre, wherein synthetic fibers have certain to the blood cell fraction of menstruation or blood and the filter capacity of compound fraction, described fraction thereby be blocked, thereby minimize the direct reciprocal action of itself and superabsorbent material, described reciprocal action otherwise can cause gel blockage.Superabsorbent material during this arranges is absorption fluids better on the contrary.This can following structure obtain, described structure is generally thin and absorptive capacity that can utilize different materials more completely, described material therefore can be usually less amount existence, therefore a kind of especially thin structure also is provided, described structure has the dimensional stability of improvement during absorbing, and therefore can increase comfortableness during use.
Fluid management and absorptive capacity to compound body fluid such as menstruation and blood that the absorbent cores of the particular of the present invention shown in Fig. 1 is concrete can provide even improve, this is owing to the specific arrangements of its component.Absorbent cores (being encapsulated in the absorbent article usually) is admitted body fluid in its ground floor, described layer comprises cellulose fibre and is substantially free of absorbent gelling material.Such as known, cellulose fibre can absorb and transmit water very efficiently, therefore when having aqueous distillate and more compound fraction comprises that the blood cell component (comprises erythrocyte and leukocyte, soluble protein, cell debris and mucus) body fluid such as menstruation or blood when being gathered by the ground floor of absorbent cores of the present invention, aqueous distillate is seen through the thickness of this layer (on so-called Z direction by transmission easily, namely perpendicular to the plane of this layer), simultaneously since capillary cause also by wicking in this layer self and away from pickup area (in so-called X-Y plane, being parallel to the plane of this layer).The compound fraction of menstruation or blood then suitable concentrated area remains near the pickup area, and advances towards the following second layer on the Z direction usually.
The second layer is substantially free of cellulose fibre then, and generally includes synthetic fibers and the absorbent gelling material that is distributed in wherein.Synthetic fibers have certain to the compound fraction of menstruation or blood especially to blood cell component such as erythrocyte and leukocytic separating power, therefore described fraction is filtered to a certain extent or blocks, so that can limit them to the interference of the superabsorbent material in the fibre structure that is dispersed in the second layer.Such as known, the compounding ingredients of menstruation or blood (especially blood cell component) is tending towards accumulating in absorbent gelling material for example on the outer surface of super absorbing particles, therefore can produce certain screen effect, described effect can cause gel blockage and can stop further absorption.
This can be avoided in absorbent cores of the present invention, its in the concrete layout of above-mentioned embodiment of the present invention, in addition utilized the uniqueness of its different materials and the characteristic of contrast to a greater extent, therefore can produce cooperative effect.In addition, this also obtains with following structure, is thin when described structure is initial, and does not change its thickness basically when absorbing, therefore remaining valid property and comfortableness.
If absorbent gelling material is selected from the polyacrylate based polyalcohol described in the European patent application EP 05023061.4 mentioned above, described polymer is very slight crosslinked or not crosslinked Polyacrylate based materials basically, and then above-mentioned cooperative effect can further strengthen.In fact described polymer is especially effective aspect sorption complex liquid such as menstruation or blood, and when absorbing this type of fluid, generally do not demonstrate tangible swelling and gel blockage subsequently, as traditional superabsorbents, but play a part the thickening agent of body fluid to a certain extent, be certain gelatinous material thereby in absorbing structure, namely in the gap of fiber, be fixed, and do not cause basic swelling also to cause the realizable increase of the general thickness of absorbent cores then.
According to alternative embodiment of the present invention, absorbent cores optional the 3rd layer 80 (as shown in Figure 2, its can be provided at absorbent cores on the surface of clothes) can be used as the wicking layer of interpolation, its admittance and distributing may be failed by two upper stratas institute unnecessary fluid of reservation fully.In addition, as described in about ground floor, cellulose fibre adds that the shortage of basic superabsorbent material can make this layer gather and spread the aqueous distillate of body fluid such as menstruation or blood especially effectively, moreover is after at least a portion of compound fraction especially blood cell component is kept by the second layer to a certain extent.
Egative film
Comprise that the absorbent article of core also can comprise egative film 90 as described in the present invention.Egative film mainly must prevent from being absorbed be contained in absorbing structure in the effluent moistening contact medicated clothing such as underwear, trousers, nightwear, underwear and shirt or the jacket of absorbent article, thereby can be used as stopping that convection cell transmits.According to one embodiment of the invention, egative film also can allow at least water vapour or water vapour and air, and the two sees through, and therefore allows air circulation to enter goods and water vapour circulation effusion goods.Egative film can extend at whole absorbent structure usually, and extensible enter and form in flank, side parcel element or the flap (when existing) partly or entirely.
The various elements of absorbent article of the present invention, namely top flat, egative film and absorbent cores can join to according to known technology usually and go up to form absorbent article each other.
Each element of goods can engage for any method of fixing two contiguous material layers by known in the art, makes these layers directly interconnect or directly interconnect by joint method.Suitable joint method comprises binding agent, fusion bonding, ultrasonic bonding, stitching, heating (for example by at confluce welding fiber or molten polymer so that fiber or thin film are connected to the hot adhesion of going up each other), embossing, curls, pressure bonding, dynamic mechanically bonding or their combination.
If particularly absorbent article is used as sanitary towel or panty liners, then absorbent article also can have the underpants for women buckling clamping part, and described parts provide in order to goods are connected to the parts on the underwear.For example, the underpants for women buckling clamping part can comprise the lip-deep underpants for women cement towards clothes of egative film, or alternatively, can comprise that mechanical fastener such as hook-loop fastener is such as the sort of, the snap-fastener of selling with trade name VELCRO or holder.The underpants for women cement is provided for goods are fixed to parts on the underpants for women, and randomly also is provided for being fixed to goods (when dirty) folding and the parcel packing goes up in order to make the parts of waste treatment easily.
Comprise that the absorbent article of absorbent cores of the present invention can be used for the situation of sanitary towel valuably.Therefore, this absorbent article also can have following all that feature and parts: described feature and parts are typical in the situation of their desired use for product.For sanitary towel, this especially comprises flap or flank, and described flap or flank are arranged on the side of sanitary towel, and centers on the crotch portion edge fold of underwear.Flank can be provided as element such as the top flat of sanitary towel and/or or several extension in the egative film.They also can be made independently and join on the side of sanitary towel.
Embodiment
Absorbent cores comprises the layer structure that forms with continuation method by different layers is provided according to known air lay technology as described in an embodiment of the present invention.This structure is by press polish and heat-treat.This core comprises ground floor, and it comprises the 36g/m of homogeneous mixture form
2Cellulosic pulp fibers and 4g/m
2Bicomponent fibre; The second layer, it comprises mixed uniformly 8g/m
2Bicomponent fibre and 32g/m
2The absorbent gelling material granule; And have the 3rd layer of the composition identical with ground floor.Bicomponent fibre is the PET/PE bicomponent fibre that can trade name Trevira HC255B obtains, and is the length of 2.2 dtexs and 3mm, and absorbent gelling material can trade name Aqualic CA TypeQX-L-1074 available from Nippon Shokubai Co.Ltd..
Absorbent cores has dried thickness and the 0.103g/cm of 1.16mm
3Dry density, be 1.05g/cm and wet thickness is 1.44mm and wet density
3
Artificial through liquid (AMF)
Artificially be based on the blood of the sheep of modification through liquid, described blood be modified to guarantee its critically be similar to aspect viscosity, conductivity, surface tension and the outward appearance people through liquid.It walks to the 45th of the 18th row as the 33rd of the row of the 17th in the United States Patent (USP) 6,417,424 that transfers P﹠G and goes described such preparation, and described patent is used as list of references.
Dimension disclosed herein and value are not intended to be understood that strictly to be limited to described exact value.On the contrary, except as otherwise noted, each such dimension all refers to the numerical value of quoting and centers on the scope that is equal on the function of this numerical value.For example, the dimension that is disclosed as " 40mm " is intended to expression " about 40mm ".
The All Files of quoting in detailed Description Of The Invention is all incorporated herein by reference in relevant portion.Should not be interpreted as all admitting that for quoting of any file it is relevant prior art of the present invention.When any implication of term in any implication of term among the present invention or definition and the file of introducing for your guidance or when defining contradiction, should obey implication or the definition of giving this term in the present invention.
Though illustrated and described specific embodiments of the present invention, it will be apparent to one skilled in the art that and under the situation that does not deviate from essence of the present invention and scope, can make a plurality of other changes and modification.Therefore, claims all such changes and modification of being intended to be included in the scope of the present invention.
Claims (6)
1. sanitary towel, it comprises the absorbent cores for absorbent article, and described core has towards wearer's surface with towards the surface of clothes, and described core comprises the cellulosic layer structure with at least two layers, and described core comprises:
Ground floor, described ground floor be positioned at described on wearer's surface and described ground floor comprise cellulose fibre and be substantially free of absorbent gelling material;
The second layer, the described second layer comprise synthetic fibers and are dispersed in the absorbent gelling material in the structure of the described second layer equably or anisotropically and are substantially free of cellulose fibre;
Described core comprises 10% to less than 70% cellulose fibre; And
Described core comprises 10% to less than 70% absorbent gelling material,
Wherein said percentage ratio is based on the percentage by weight of the dry weight of described core.
2. sanitary towel as claimed in claim 1, wherein said core comprises the 3rd layer of the described second layer of contiguous described core, and described the 3rd layer comprises cellulose fibre and is substantially free of absorbent gelling material.
3. sanitary towel as claimed in claim 1, wherein said core has dry density and wet density, and described wet density is greater than 5 to 20 times of described dry densities.
4. sanitary towel as claimed in claim 3, wherein said dry density is between 0.04g/cm
3And 0.3g/cm
3Between.
5. the described sanitary towel of each claim as described above, wherein said absorbent gelling material comprises Polyacrylate based materials, described material has at least 30% extracted umber by weight, and described umber is evaluated and tested according to extractable matter method of testing as referred to herein.
6. sanitary towel as claimed in claim 5, wherein said absorbent gelling material is granular materials, described granular materials has the particle mean size between 10 μ and 1,000 μ.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP07000630.9 | 2007-01-12 | ||
| EP07000630A EP1943992B1 (en) | 2007-01-12 | 2007-01-12 | Absorbent core having improved structure |
| PCT/IB2008/050079 WO2008084454A1 (en) | 2007-01-12 | 2008-01-10 | Absorbent core having improved structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101583330A CN101583330A (en) | 2009-11-18 |
| CN101583330B true CN101583330B (en) | 2013-09-11 |
Family
ID=38057293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008800021655A Active CN101583330B (en) | 2007-01-12 | 2008-01-10 | Absorbent core having improved structure |
Country Status (11)
| Country | Link |
|---|---|
| US (1) | US9452095B2 (en) |
| EP (1) | EP1943992B1 (en) |
| JP (1) | JP2010514489A (en) |
| KR (1) | KR20090094134A (en) |
| CN (1) | CN101583330B (en) |
| AT (1) | ATE546119T1 (en) |
| BR (1) | BRPI0806487A2 (en) |
| CA (1) | CA2675380A1 (en) |
| ES (1) | ES2382750T3 (en) |
| MX (1) | MX2009007421A (en) |
| WO (1) | WO2008084454A1 (en) |
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| DE10225943A1 (en) * | 2002-06-11 | 2004-01-08 | Basf Ag | Process for the preparation of esters of polyalcohols |
| DE10239074A1 (en) * | 2002-08-26 | 2004-03-11 | Basf Ag | Water-absorbing product, e.g. useful for making hygiene articles, comprises water-absorbing polymer particles and a nitrogen-containing polymer |
| US20060069367A1 (en) * | 2004-09-29 | 2006-03-30 | Andrew Waksmundzki | Absorbent core having two or more types of superabsorbent |
| DE602006019603D1 (en) * | 2005-07-26 | 2011-02-24 | Procter & Gamble | FLEXIBLE, ABSORBENT ARTICLE WITH IMPROVED ADJUSTMENT TO THE BODY |
| EP1776967B2 (en) * | 2005-10-21 | 2013-03-13 | The Procter & Gamble Company | Absorbent articles having increased absorption and retention capacity for proteinaceous or serous body fluids |
| ATE464072T1 (en) * | 2005-10-21 | 2010-04-15 | Procter & Gamble | ABSORBENT ARTICLE WITH INCREASED CAPABILITY TO ABSORB AND RETENT PROTEIN CONTAINING OR SEROUS BODY FLUID |
| EP1776966A1 (en) * | 2005-10-21 | 2007-04-25 | The Procter and Gamble Company | Absorbent article having improved absorption and retention capacity for proteinaceous or serous body fluids |
| EP1829563B1 (en) * | 2006-03-03 | 2013-05-01 | The Procter and Gamble Company | Thermoplastic absorbent material having increased absorption and retention capacity for proteinaceous or serous body fluid |
-
2007
- 2007-01-12 AT AT07000630T patent/ATE546119T1/en active
- 2007-01-12 EP EP07000630A patent/EP1943992B1/en active Active
- 2007-01-12 ES ES07000630T patent/ES2382750T3/en active Active
- 2007-12-13 US US11/955,429 patent/US9452095B2/en active Active
-
2008
- 2008-01-10 JP JP2009543571A patent/JP2010514489A/en active Pending
- 2008-01-10 KR KR1020097014396A patent/KR20090094134A/en active IP Right Grant
- 2008-01-10 BR BRPI0806487-3A patent/BRPI0806487A2/en not_active IP Right Cessation
- 2008-01-10 WO PCT/IB2008/050079 patent/WO2008084454A1/en active Application Filing
- 2008-01-10 CA CA002675380A patent/CA2675380A1/en not_active Abandoned
- 2008-01-10 MX MX2009007421A patent/MX2009007421A/en active IP Right Grant
- 2008-01-10 CN CN2008800021655A patent/CN101583330B/en active Active
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4467012A (en) * | 1981-08-05 | 1984-08-21 | Grain Processing Corporation | Composition for absorbent film and method of preparation |
| CN1037270A (en) * | 1988-03-31 | 1989-11-22 | 普罗格特-甘布尔公司 | Thin and softish sanitary towel |
| US5977014A (en) * | 1993-10-22 | 1999-11-02 | The Procter & Gamble Company | Absorbent composite structure formed of a substrate and cross-linkable hydrogel polymer particles |
| US5669894A (en) * | 1994-03-29 | 1997-09-23 | The Procter & Gamble Company | Absorbent members for body fluids having good wet integrity and relatively high concentrations of hydrogel-forming absorbent polymer |
| CN1147199A (en) * | 1994-05-04 | 1997-04-09 | Sca莫里恩克公司 | Method for producing absorbent structure which includes layer of superabsorbent material |
| EP0700672B1 (en) * | 1994-09-09 | 2000-05-24 | The Procter & Gamble Company | Absorbent composite structure and method of making the same |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080172017A1 (en) | 2008-07-17 |
| EP1943992B1 (en) | 2012-02-22 |
| JP2010514489A (en) | 2010-05-06 |
| ES2382750T3 (en) | 2012-06-13 |
| CN101583330A (en) | 2009-11-18 |
| US9452095B2 (en) | 2016-09-27 |
| WO2008084454A1 (en) | 2008-07-17 |
| ATE546119T1 (en) | 2012-03-15 |
| MX2009007421A (en) | 2009-07-17 |
| KR20090094134A (en) | 2009-09-03 |
| BRPI0806487A2 (en) | 2011-09-27 |
| CA2675380A1 (en) | 2008-07-17 |
| EP1943992A1 (en) | 2008-07-16 |
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